William Kral Email & Phone Number

• Designed an event-sourced Entitlements and eSIM provisioning service, providing self-directed verification for mobile network operators to integrate their systems
• Added encryption of private information within events, allowing for long-term history retention with the ability to forget specific information, meeting privacy requirements from the GDPR

Vancouver, British Columbia, Canada

• Led design and development of an eSIM connectivity platform, connecting consumer devices and managing fleets of connected devices for enterprises
• Designed and documented a REST API allowing businesses with existing management software to integrate with our platform
• Achieved high success rates in error-prone environments with asynchronous workflows designed to automatically respond to errors, attempt corrective action before retrying, and back off when an outage is detected
• Developed APIs and Workflows with Python, Flask, Celerey, RabbitMQ, PostgreSQL, and Redis, run on AWS managed with Teraform and Saltstack
• Added hooks into the workflows, allowing our team to quickly integrate highly customized systems from a variety of global telecoms and their vendors
• Worked with Telecom OEMs, Network Operators, and Automotive Manufacturers across the globe to design solutions and APIs to integrate their infrastructure

Vancouver, Canada Area

• Designed and led development of a mobile telecom service and eSIM provisioning platform that would be acquired and adapted into IDEMIA’s offering
• Built a multi-brand eCommerce component supporting distinct customers in several countries
• Developed a geographically redundant Online Charging System directly connected to a network operator’s data centre using Clojure, Go, and Kafka

Vancouver, Canada Area

• Led development of qdup.com and wannawatch.it to track availability of movies on streaming and video-on-demand platforms
• Built asynchronous workers to check availability changes from APIs and retrieving data dumps
• Developed with Python, Flask, jQuery, Celery, Nginx, uWSGI, RabbitMQ, Redis, Riak, Elasicsearch and SQLite, run on AWS EC2, deployed with Chef

Vancouver, Canada Area

• Built a neighbourhood-based social network using Python, MySQL, and jQuery
• Developed cross-site request forgery prevention, geocoordinate-based content queries, endless scrolling content loading, reply notifications, user polls, and events
• Made front-end servers stateless via authenticated client session storage so they could be run in a high-availability configuration

• Developed service and database layer components in Java with Spring, Hibernate, and MySQL
• Restructured database queries to improve performance by up to 10x
• Led replacement of the existing Content Delivery Network, saving over $20,000 per month

• Led front-end development of a business telecom service ordering system using Java EE and JSF through task assignment, code reviews, and mentorship
• Served as the interim solution architect assessing change request impacts for cross-component projects

• Worked with architecture team to analyze, estimate, and develop solutions for ordering and delivering telecom products

• Supported production systems by diagnosing and debugging problems for a J2EE web service telecom product ordering application used by 7000+ call agents
• Developed a custom monitor which would visually highlight irregularities in a JavaScript client served by a Python back-end, indexing performance data from our web services

• Maintained the EJB Deploy component for WebSphere Application Server which generated scaffolding code and database queries from Java callbacks and XML configuration
• Developed automated build verification test suite to catch regressions in nightly builds

• Resolved enterprise customers' technical problems related to the application WebSphere Studio Application Developer by answering questions and tracking defects reported by customers